Unable to set configuration in .angular-cli.json in the apps section with ng set apps.0

[johnpapa]

OS

Mac OSX 10.12.3

Versions.

$ ng -v
@angular/cli: 1.0.0-rc.1
node: 6.9.1
os: darwin x64
@angular/common: 4.0.0-rc.2
@angular/compiler: 4.0.0-rc.2
@angular/core: 4.0.0-rc.2
@angular/flex-layout: 2.0.0-rc.1
@angular/forms: 4.0.0-rc.2
@angular/http: 4.0.0-rc.2
@angular/material: 2.0.0-beta.2
@angular/platform-browser: 4.0.0-rc.2
@angular/platform-browser-dynamic: 4.0.0-rc.2
@angular/router: 4.0.0-rc.2
@angular/cli: 1.0.0-rc.1
@angular/compiler-cli: 4.0.0-rc.2

Repro steps.

Try to set the configuration in .angular-cli.json with:

ng set apps.0.prefix foo

This yields an error.

So do ng set apps[0]prefix foo and ng set apps[0]prefix "foo"

Error

$ ng set apps.0.prefix foo
Unexpected token o in JSON at position 1
SyntaxError: Unexpected token o in JSON at position 1
    at Object.parse (native)
    at resolve (/Users/john/_play/angular-hello/node_modules/@angular/cli/commands/set.js:62:39)
    at Class.run (/Users/john/_play/angular-hello/node_modules/@angular/cli/commands/set.js:37:16)
    at Class.<anonymous> (/Users/john/_play/angular-hello/node_modules/@angular/cli/ember-cli/lib/models/command.js:134:17)
    at process._tickCallback (internal/process/next_tick.js:103:7)

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